Cooley, Thomas M.
The general principles of constitutional law in the United States of America
Little, Brown, 1898
 Buku Teks SO
Fincher, E. B.
The President of the United States
Abelard-Schuman, 1955
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Resolution and decision adopted by the general assembly during the first part of its forty-fourth session from 19 September to 29 Desember 1989 Department of Public Informetion, United Nations
New York United Nations 1989,
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Risjord, Norman K.
America a history of the United States
Prentice-Hall, 1985
 Buku Teks SO
Stuart, Graham Henry, 1887-
Latin America and the United States
Appleton-Century-Crofts, 1955
 Buku Teks SO